Polychaetes - Polychaete, Radiole, Sandcastle Worm, Glycera, Chaetopterus, Nereididae, Hesionidae, Lugworm, Nereis, Canalipalpata (Paperback)

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 23. Chapters: Polychaete, Radiole, Sandcastle worm, Glycera, Chaetopterus, Nereididae, Hesionidae, Lugworm, Nereis, Canalipalpata, Alitta succinea, Palolo worm, Polynoidae, Bobbit worm, Eunice, Pigbutt worm, Alitta virens, Bearded fireworm, Psamathini, Nereis vexillosa, Harmothoe, Sea mouse, Hesiocaeca methanicola, Harrimaniidae, Spirorbis spirorbis, Spirorbis corallinae, Chaetophteridae, Peacock worm, Eunicidae, Heteracanthocephalidae, Tomopteris, Glyceridae, Saccoglossus, Saccocirridae, Capitella teleta, Pectinaria, Capitella capitata, Spionidae, Nephtys, Nephtyidae, Burgessochaeta, Polyacanthorhynchidae, Australonuphis, Hesioninae, Mesonerilla prospera, Odontosyllis enopla, Spintheridae, Sabellida, Platynereis, Insolicorypha, Opheliidae, Social feather duster, Ramphoprionid, Nerillidae, Lombricine, Sabella, Stephenoscolex. Excerpt: The Polychaeta or polychaetes are a class of annelid worms, generally marine. Each body segment has a pair of fleshy protrusions called parapodia that bear many bristles, called chaetae, which are made of chitin. Indeed, polychaetes are sometimes referred to as bristle worms. More than 10,000 species are described in this class. Common representatives include the lugworm (Arenicola marina) and the sandworm or clam worm Nereis. Polychaetes as a class are robust and widespread, with species that live in the coldest ocean temperatures of the abyssal plain, to forms which tolerate the extreme high temperatures near hydrothermal vents. Polychaetes occur throughout the Earth's oceans at all depths, from forms that live as plankton near the surface, to a 2-3 cm specimen (still unclassified) observed by the robot ocean probe Nereus at the bottom of the Challenger Deep, the deepest spot in the Earth's oceans. Polychaetes are segmented worms, generally less than 10 centimetres (3.9 in) in length, although ran...